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GEOMATRIX <br /> TABLE 3 <br /> GROUNDWATER ANALYTICAL RESULTS <br /> FOR MONITORING WELL SAMPLES' <br /> Surland Homes Property <br /> Tracy, California <br /> Results reported in micrograms per liter(µg/1) <br /> Sample Date Ethyl- <br /> H) Collected TPHg' TPHd3 Benzene° Toluene° benzene° Xylenes° PAHss <br /> TW-1 9/14/98 <50 <50 <0.5 <0.5 <0.5 <0.5 ND6 <br /> 10/16/98 <50 <50 <0.5 <0.5 <0.5 <0.5 ND <br /> 7/29/99 <50 110/<50' <0.5 <0.5 <0.5 <0.5 <0.1 <br /> 10/14/99 <50 120/<50 <0.5 <0.5 <0.5 <0.5 <0.1 <br /> 1/14/00 <50 <50/<50 <0.5 <0.5 <0.5 <0.5 <0.1 <br /> 4/19/00 <50 61/<50 <0.5 <0.5 <0.5 <0.5 <0.1 <br /> TW-2 9/14/98' 1200 520' <0.5 <0.5 1.7 4.1 Acenaphthene 0.9' <br /> Fluorene 2.2' <br /> Phenanthrene 1.4' <br /> 10/16/98 NS10 NS NS NS NS NS NS <br /> 7/29/99 NS NS NS NS NS NS NS <br /> 10/14/99 NS NS NS NS NS NS NS <br /> TW-3 7/29/99 <50 100/<50 <0.5 <0.5 <0.5 <0.5 ND <br /> 10/14/99 <50 150/<50 <0.5 <0.5 <0.5 <0.5 ND <br /> 1/14/00 <50 <50/<50 <0.5 <0.5 <0.5 <0.5 <0.1 <br /> 4/19/00 <50 <50/<50 <0.5 <0.5 <0.5 <0.5 <0.1 <br /> Notes: <br /> 1 Samples collected by Geomatrix Consultants,Inc. and analyzed by Friedman&Bmya,Inc.of Seattle, <br /> Washington. <br /> 2 TPHg=total petroleum hydrocarbons quantified as gasoline(C4-CIZ)analyzed using EPA Method 8015M. <br /> 3 TPHd=total petroleum hydrocarbons quantified as diesel(CIO-C24)analyzed using EPA Method 8015M,with a <br /> silica gel preparation procedure. <br /> 4 Benzene,toluene, ethylbenzene, and xylenes(BTEX)analyzed using EPA Method 8021B or 8260B. <br /> 6 PAHs=polynuclear aromatic hydrocarbons analyzed using EPA Method 8270 SIM or 8270C SIM. <br /> 6 ND=not detected at or above the laboratory reporting limit. <br /> ' TPHd result without/with silica gel preparation procedure,respectively. Concentration without silica gel <br /> preparation procedure represents polar compounds likely resulting from intrinsic bioremediation of residual <br /> petroleum at the site. <br /> ' Sheen observed on groundwater prior to sampling; sample included entrained sheen. Sample collected at the <br /> request of the San Joaquin County Public Health Services. <br /> ' Sample filtered prior to extraction using a 0.7 micron glass fiber filter. <br /> 10 NS=not sampled due to presence of sheen on groundwater. <br /> IAD.Safe\6D%h W7.OnHRA\HRA Table 3.d. <br />